Where cows were grazing last week, scientists are now pouring over two trenches dug on farmland near Morrinsville in Waikato.
They are investigating the recently discovered Te Puninga earthquake fault line. It was found using the latest aerial mapping technology.
The discovery of the fault line doesn't increase the risk of a quake but it does give scientists valuable information.
RNZ's Waikato reporter Andrew McRae went out for a look.